Work holder



July 10, 192s. 141276290l c. sCHRoN WORK HOLDER OF oLnvELAnD, OHIO, AAssreivon Y'ro 'rnn Avvnrrn MOTOR COMPANY, 'f

Patented v'July 10, v1928.

CHRISTY sonnen,

i wenn ric F CLEVELAND, OHIO, A CORPORATION OF'OHIZO.

WORK HOLDER.`

Yapplicati@ flied May 2 7,

Y object of my invention resides in the provision of an improved Work holder which will rigidly retain the work against movementrelative to a tool, during a machining 1o operation thereon, and which may be operated expeditiously. l

Another object of my invention resides iii the provisionv of a work holding mechanism,

which may be made of A,varying sizes, wherevl by it may beinterchangeably employed with castings of numerous dimensions, v

' 'Another object of my invention resides in the provision o f an improved work holding mechanism capable of being adjusted to ,2 0 adapt itselfto a particular piece of work to be operated upon. i. Another object of my invention resides in theprovision of animproved work holder which is durable in construction, readily op- .,25 erable and .wherein provision is made for replacement of worn parts. ,A

These and other Objects of my invention and the invention itself willbecome apparent from referenceVV to the following descriptionV 3Q of an embodiment thereof and in which description. reference will be had tothe ac companying'dr'awings forming apart of this specification;

Referring to the drawings: 4 vFig. 1 aI-sectionalviewv of a'fragment of a metal workingvmachine embodying my invention in/elevation;`

Fig. 2 isa top plan view of the foregoing .f embodiment illustrating in dotted lines an intermediate Operative position thereof;v

Fig. `3 is a transverse sectional view of Y the foregoing embodiment, the'view being taken onthe line 33 Aof Fig. 12, the partsv being enlarged in .this vviewgover similar p-arts inthe `foregoing figures; c

Fig. lisa top,l plan viewl of the foregoing.

embodiment illustrating one v.Operative posi tion of the same;

. Fig, 5 is aview similar to=Fig .illustrat ing'v another. Operative'position of fmy in-` ventiongand Y fFig. 6 is a perspective view of one of the boltsy employed in the foregoing embodiment.y Referring to all of the'igures .of the draw-l My improved work holder preferably coni-y radial bores and 36 having threaded 1927. seriai No, 134,599.1

ings'in all of which like'parts are designated by like reference characters, at`107 I show a baseor table portion 'offa machine adapted to i perform machining operations upon aV piece of metallicwork 11 supported thereon. 60

prises a lever 12 pivoted at 13 toa lug 14 of l the table. and extends horizontally a relatively short distance under the table below ai depending lug 15 Y carried by the table into 'which a. transversely` disposed shaft 16 is jouinaled. Saidlshaft is provided with a Caml? at oneend thereof andanoperating vhandle vlever 18 at the other end, both non rotatably vsecured to the. shaftY 16, wherebyn'l vswingingof th'e'handle k18 in a downward direction ywill rotate the high Vpoint of the cam into engagement with the lever 12 ad' jacent the free endj thereof, swinging the lever downwardly onits. pivot.V Pivoted to the lever 12. intermediateits ends, at 1 9, I providea vertically'disposed post having a` bifurcated lowerend 21 disposedover the lever 1 2l and arthreaded upper end 22.

Said ypost extends upwa'rdlythrough an aperture 23 inthe tablelO and the upperend of the post provided with a pairof diametrically opposed longitudinallyv extending'key slots 24 and 25. Q

Mounted on the post 2O adjacent the .upper end'thereof is an expansible work en-l Vgaging-head generallyindicated by the reference numeral 30, said vhead. preferably comprises a plurality of superposed'plates or disks 31,32 and 33. Each of the plates are centrally4 apertured to provide an axially extending bore l3ithro`ugh which the post `20 projects. The bottom-'most plate 31 is pro-v vided with a pairof di'ametrically opposed mouths, into which pins 37 are disposed hav-` ing threaded outer end portionsBEiy threaded. into themouths of the bores.- Thepins 37Y are provided: with the usual screw-drivel* receiving slots 39. The inner ends ofthe pins 37fextend into the diametrically opioo yposed key slots 24 and 25 and areadapted tol rest Aupon the Yend 'walls 40 of1V the key slots, Vto support -thevhead on the post 20.

Secured to theplate 31 byrmaohine screws 12 and .43, isv an "intermediately disposed plate 32having radially extending slotsli? and*l therein of rectangular configuration. A pair ,of boltsil and 45 are inserted into the radially'ertending slots L17 and/18 of a 1 1@ the walls thereoithe plate 3l providing theY supporting' base upon which the bolts slide, The inner opposed ends of the bolts la and 45 are provided with semi-circular re` La i cesses 50 and 5l, whereby they will not engage with the post 2O when in their inner-4 most contracted positions, but will provide a circular clearance recess, when jointed together, for the post. i Y

The bolts may be reciprocated inwardly or outwardly by means of' apalir of vertically disposed pins 52 and `53 having enlarged lcnurled portions, the shoulders 82 oli-which Vrest on the edges orp apertures 54 and 55 diamctrica'lly opposite each other in the topinost plate The pins extend downwardly through "the apertures, and'through'arcuate slots GO'and 6l in the intermediate plate 32, terminating in angularly disposed grooves 5G and 57 in the upper faces of the bolts, whereby an operator may grasp the knurled portions of the pms and 53 vand by oscillating or `partially rotating the' same wit-hin' the arcuate slots will cause the lower endsof the pins to engage the side walls et the groovesv 56 and 57 eli'ecting a camming action thereon to simultaneously reciprocate the bolts towards or away from each other depending upon the position to which the operator desires to move them. The angular grooves are parallel to each other and on an angle tangential to the post 20.

Oscillation of the pins 52 and V53 may be effected simultaneously by movement of but one of thefpins by virtue of the topm'ost plate 33 which is connected with both ot the pins. riheV topmost plate is: provided with a centralbore. of asize relatively larger than the bores of the other two plates'. An upstandin'g Vflange '68 preferably formed integral with the plate 32 telescopes into the bore ot the 'top plate and snugly vits therein to provide a bearing portion 64 about which the plate 33 may be revolved.y The bore of the plate 33 is enlarged at 65 Jfor the reception of a retaining nut 66 having an annular' flange 67. The base wall 68 and the top wall 69 of the bore-,G5r andthe upstand ing flange G3, respectively, are concaved to receive the convex base surface 70 ot the nut 66, which when threaded onto the post 2O and tightened down by an operator grasp; ing theV knurled portion 7l thereof, will cause YtheY nut to engage' the` concaved sur-Y faces 53' antlGS) oit the platesy and 32 and secure' the plate 33 against rotation.

ln use, a piece of work- 11, such iior eX- a'mple as oneot the castings of an automobile which is to receive machining operations thereon, is placed on the table l0 oitl a metal i'vorking machine, and the herein described embodiment may be operated as `follows:

Leffe-aso The lever 18 is swung to a vertical position pern'iitting the post 2O toy move vertically, Vwhichv post rextends through a relatively large aperture 8O in -the top wall of 'the work. AThe headl BOis disposed above the top wall of the work in alignment with the aperture 8O and the bolts iet and 45 have been contracted into the position shown in Fig. i or 'thefdranfings The work holder when so positioned, the nut 6G is turned down int-o contact with the concave faces of Vthe plates 32 and 33, aft-cr the head has been properly adjusted on the pivot to the desired height, to hold the same against acciwhich in turn effects a camming actionk on` the sides olf the grooves 56 and 57 Vof the` bolts ill and i5 reciprocating' the same in opposite directions radially into the'position indicated in Figs.A 1,3 and5. l

he bolts `A- and i5 may be suiliciently er; panded to bridge the aperture 8O of theV Vwork and Contact with the top wall of the' work in the manner shown in Figs. l and 3. Bolts may-be constructed in varying lengths. whereby they may be employed on work of varying sizes wherein the distance to YbeV bridged may be greateror less than the diameter of the aperture 8O illustrated in the present embodiment of my invention.

Operator now swings the lever 18 down` wardly into the horizontal position, as shown in l of the drawings, thereby rotating the cam 17, the high point of which contacts with the lever l2 effecting a downward pull thereon and on the post 2O and head 30 causing the bolts all and 45 to rigid-- ly engage with the top wall of the work ll effectively securing the work in its indexed position relative to the tool.L i

The head 3() may at all times be carried on thep'ost 2O thereby eliminating time lost by an operator in locating and rdisposing the ordinary C-bolt washer which lhas heretotore been used 'for the herei'n'described pur-` pose and which many times becomes' diss placed due to its detachable form.l One of the advantages of my invention is to elimitra nate the necessity of requiring such a' washer.

ran

from the embodiment herein illustrated and j described but without departing from the Y' spirit of my invention.

I claim: j. l. In a device'for holding work duringV a machining operation thereon, .the combina- .tion .with awork supporting frame, of an expansible head, adjustable mounting means for the headqsaid head comprising a pair 'of reciprocable bolts, and means-mounted in the head for reciprocating -the bolts towards and away from each other intoy engagement with an upper surface of the 'work tohold the vsame in the frame, said adjustable mounting means comprising a post supported on the frame, and means for reciprocating said to eifect movement of the head.

i 2.'In a work holder, the combination with a work supporting base, of an expander head for engaging the work, adjustable mounting means :tor the-head, said head comprising a plurality of superposed plates, aradial bore.

comprising a vertically disposed post, an ex- Vil() pander head carried on the post, said head comprising bottom, intermediate andr top plates, means to'retain the plates on the post, transverse bores extending across the intermediate plate, and arcuatelydisposed slots therein, a pair of reciprocable boltsslidable in said bores, angular grooves in said bolts disposed below the arcuate slots, pins carried by the top plate and extending through .said slots into the grooves whereby movement of the pins will reciprocate the bolts,

and means for-moving the workholder-into and out of engagement with the work.

Il. In a device for holding work during `a machining operation thereon, the combination with a work supporting frame, of an expansible head, adjustable mounting means for the head, said head comprising a pair of reciprocable bolts, and means mounted in the head for reciprocating the bolts towards and away from each other into engagement with an upper surface of the work to hold'the same in the trame, said adjustable mounting means comprising a post, a lever pivoted to the frame, said post pivoted to the lever intermediate the ends thereof, and means for swinging the lever to effect movement of the head. l Y

5. In a device t'or holding work during a machining operation thereon, the combination with a work supporting frame, of an postv expansible head,`adjustable `mounting. means.

for vthe head, said headfoomprisinga` pair oi' ieciprocable bolts, and means mountedinv the head for reciprocating thefbolts towards and vaway from each other into'engagement..

with an upper surfaceotthe -worltt-'o hold. the samein the frame, said adjustable mount-f ingmeans comprising a'post extending upwardly :through any aperturein the frame,

a lever pivotedtofthe frame, said post pivoted i to the lever intermediate the endsfthereof', said. post having van end {thereof screw-A threa-ded, saivd head threaded thereon, and means for swinging saidlev-er to'eiect movement of the head. f

machining.V operation thereon', the combina- V tion with: aY work 'supporting trame, of fan expansible head, adjustablemounting means forthe head,fsaidhead comprising apair of reciprocable bolts, and means `mounted in the head for reciprocating the bolts towards` and away from eachl otherinto vengagement with same in. the frame, said adjustable mountingv means .comprising a post projected through an upper. surface of` thegworkfto. hold the.

an aperture in .the frame, a lever pivoted to said frame, said post pivoted to the lever,

said post having a longitudinally extending slot' adjacent the upper end thereof, said head having a projecting portion adjusted to engagesaid slot .for supporting the same on the post, means for swinging said lever to effect movement of the head. Y.

7. In a device for holding work duringa Vmachining operation thereon, the combina-r tion withl a kwork support-ing frame, .of an expansible head, adjustablemounting means for thehead, said kheadcomprising a pair.` f

of reciprocable bolts, and means mounted in the head for reciproc-ating the bolts towards and away from yeach otherA into engagement with' an upper surface or" the work to hold theisame in the trame,said adjustj able mounting means comprising a post vprojecting upwardly through an aperture in the frame, a lever pivotedto the r a1n'e,saidk post pivoted to said lever, a cam yjournaled in the frame, and engaging the lever and a handle projectinglaterally of the frame, for rotating said cam. j j 8. Ina device for holding work during .a machining operation thereon, the combination with awork supporting frame, of an expansible head, adjustable mounting means head for reciprocating the'bolts towards and away from each other into engagement' with i y an upper surface 'of the work to hold the same in the frame, said adjustable mounting means comprising a vertically disposed post projected through an aperture in the frame, a lever pivoted to the frame, said post pivoted to the lever intermediatethe'` j l 80 Y, 6. Ina vdevice orfholding workduring a i ends thereof, .the upper .end of the .post beingescrew threaded and said head having a portion threaded thereon, said post having a move the head.

9. A device for holding apiece ko work centered relative to a tool, the combi-nation with a supporting frame, of an expaneible mechanism for engaging the work, comprising a. head, an adjustable mounting means 'for the head, said head comprising al plurality of: superposed plates, the intermediateol said plates having radial bores, bolts.

disposed -V in said bores and movable away from each other, a. pair of arcuate slots in the topmost plate of the head, each bolt being transversely. obliquely grooved below said slots, pins extending through .the slots into the grooves and ladapted vwhen oscillated to reciprocate the bolts toward and away tro-1n each other, transversely disposed pins carried by the lower-most plate or the head, said plates being centrally bored, a nut, said adjustable mounting means comprisingy a vertically disposed bolt extending lill; ough an aperture in the frame, a lever pivoted to the frame, said bolt being pivotedrat one end to the lever and having the .upper .end thereof threaded, said bolt also provid-ed With a pair of longitudinally extending Slots, said nut adapted to be threaded onto the threaded end ot the bolt for clamping the plates together and said transverse pins adapted to engage the slots and support ythe head on the post, a cam journaled in the frame and engaging an end of the lever and a handle extending laterally ol lthe fratrie,V for rotating the cam to reciprocate thehead whereby theboltel engage the topmost por! 'tion of the work. y,

In teetimony whereof I hereunto my signature this 25th day of May, 1927.

CHRISTY Sermon. 

